山东金青顶金矿床控矿构造特征及深部预测

金青顶金矿床位于山东牟平-乳山金矿带将军石-曲河庄断裂的南端,矿床围岩为昆嵛山花岗岩,属含金石英脉型金矿。本文通过矿床地质特征、围岩蚀变以及控矿构造特征等方面的研究,认为与成矿有关的构造活动至少划分为4期,基本控制着矿体的定位与分布。深部地球化学原生晕研究表明,矿体在垂向上具有明显的地球化学分带性,且在已知矿体下方出现近矿晕、前缘晕及尾晕特征指示元素构造叠加晕强度升高趋势。结合矿体在断裂中分布的规律以及原生晕特点,对金青顶矿床深部第二富集段进行了预测,推断在-1100m下有第二金富集段存在,且具有很大的经济价值。

Characteristics of ore controlling structure in Jinqingding gold deposit,Shangdong and its deep ore prediction

Jinqingding gold deposit is located at the south end of Jiangjunshi-Quhezhuang fracture in Mouping-Rushan gold ore belt;the country rock of the deposit is Kunlunshan granitite and belongs to gold bearing quartz vein type gold deposit.Based on the research on geological characteristics,country rock alteration and characteristics of ore controlling structure,it is concluded that structure activities associated with mineralization can be divided at least into 4 periods,which controlled the localization and distribution of the orebodies.Some regularity concerned about distribution of the orebodies in structure zone are summed up further as showing the features of thinning out and reoccurring,en echelon arrangement and same interval.The study on geochemical primary halo in depth shows that there is obvious vertical geochemical zoning and occurring near ore halo,front halo and tail halo characters at the bottom of known orebodies,which indicate increasing trend of strength of structure superimposed halo of elements.Combined with the regularities of orebody distribution in fracture and its primary halo characters,a prediction was carried out on second enrichment district of Jinqingding gold deposit at depth,presuming that there is a second gold enrichment district occurring below-1100m level and is of great economic significance.